BS 3410 Table 10 Washers

Dimensions for Round Washers with Square Holes to BS 3410

Nominal size of Bolts	Diameter of hole A Tolerance + 1/32 in	Outside diameter B	Thickness C Tolerance + 1 gauge
inch.			S.W.G.	inch.
3/8	7/16	1 1/4	11	0.116
1/2	9/16	1 1/2	10	0.128
5/8	11/16	2	9	0.144
3/4	13/16	2 1/4	8	0.160
7/8	15/16	2 5/8	5	0.212
1	1 1/16	3	5	0.212